10 THE NAUTILUS. 



Collectors who have readily detected a varietal difference in the 

 lighter weight of shells sent out as Cardium nuttallii Conrad, may 

 regret that these shells are not recognized even as a variety, but are 

 included in the synonym of Cardium (Cerastoderma) corbis Maityn. 

 Cardium blandum Gould is a synonym of C. (Cerastoderma) califor- 

 uiensis Deshayes. Cardium (Cerastoderma) ciliatum O. Fabricius ( C. 

 islandicum Chemnitz (a synonym) and Serripes grbnlandicus Gmelin 

 are Arctic sea species that are found on the Atlantic and Pacific 

 shores. Cardium aspersum Sowerby is listed as a variety of the 

 eastern coast Cardium (Papyridea) spinosum. 



Dr. Dall says Cardium (Lcevicardinm) elatum Sowerby "is the 

 largest species of the genus." We have often noted the variation in 

 shape of some of the large cardium s of the West Coast; he says of 

 these oval and rotund forms that they may possibly be correlated 

 with sex M. B. W. 



Description ok a New Species of Unio from the Creta- 

 ceous Rocks of the Nanaimo Coal Field. By J. F. Whiteaves 

 (Ottawa Naturalist, XIV., Jan., 1901 ). Unio nanaimoensis n. sp. 

 Unio hubbardi Gabb is stated to be from the Cowgitz coal mine, on 

 Graham Island, one of the Queen Charlotte Is., and probably did 

 not come from Vancouver Island, as originally reported. 



Notes on some Land and Freshwater Mollusca from 

 Fort Chimo, Ungava Bay. By J. F. "Whiteaves (Ottawa Nat., 

 XIV., March, 1901). The specimens were collected by Mr. W. 

 Spreadhorough in 189G, and comprise Limnata pahistrus var. vahlii 

 Planorbis arcticus (" which may be only a synonym of P. parvus,") 

 Valvata sincera and Pisidium steenbuckii. Notices of previous rec- 

 ords of non-marine mollusks of Labrador are given. 



Additions to the Marine Mollusca of the Bermudas. 

 By A. F. Veri ill and Katherine J. Bush. The Ni dibranchs 

 and Naked Tectibranchs of the Bermudas. By A. E. 

 Verrill. (Trans. Conn. Acad, of Sci., X., 1900). The additions to 

 the fauna recorded in these articles are mostly from the collection 

 made at the Bermudas in April and May, 1898, by the Yale scien- 

 tific party under Professor Verrill. In the first paper about 80 

 species an' recorded for the first time from the Bermudas, 25 of 



